Improved glass-mould



n 'rt aware-schw amd THOMAS G. otrrnnsoN, or PnfiLADELPHIA, PENNSYLVANIA, As-

SIGNOR. @To s. nowtnnor sAMEPLAcn j (Letters Patent No. 87,506, dated Zil'arch 2, 1869.

nurnovnn GLASS-MOULD.

sddlll@ MBU@ to in these Lettera Patent. and making part of thanamo.

To all ichom it may concern.- 'l 4 `Be it known that I, lHoMas G. Or'rnRsoN, of Philadelphla, Pennsylvania., have invented an ImprovementilJ Glass-Moulds; and I- do hereby 'declare the tillowing to be a full, clear, aud exact description of the same.

`My invention consist-s of a stripper-plate, so adaptedY to the-base 'and' cover-plate of a glass-mould, that it may be a `convenient medium forthe ready removal of the pressedglassphiect from the base, before it can, ,by cooling andshrink.. ge, embrace any projection on the said-base so tightly-as to canse the fiactme of the l object.

My invention further eonsists'ih arranging the pro' 'jecting parts ofthe lower portion of the` mouldon a central/piece, which can slidev inthe base, and can thus bfwithdrax'vn from-the pressed glass, thereby permitting the latter to contractr without danger of fracture.

In order to jenable others skilled in the-art to make and use my invention, I will now proceed to describe its :construction and operation, reference being had to the accompanying drawing, which forms a part of this speciticatioii, Aand iuwhich-' I I vFigures 1,2, y3, `and 4,' represent, in section, my improved mould, and illustrate the .relative positions of the various parts in the progressive operations.

Similar letters refer to similar parts throughout the several views. j .The mould consists ot' four main parts, namely, the

plunger A, cover-plateB, strippenplate C, and base D.

It should be' understood that the plunger A and `plate B are so connected to a press, that the' plate B can ymove vertically, to a limited extent', independently of the plunger.

The base D has a central circular recess, cf, boundedby an annular flange, l), between which and a rib, c,

intel-venes an annular recess, 1, and into the lat-ter fits snugly the annular stripper-plate O, the iuneredge of' 'which is bevelled or curved at e. @The stripper-plate has an 4annular rib, f,. 'withi which fits the 'lower portion of the coverplate B, and the latterhas a .central opening, `in which slides the cylindrical plunger A, and which has, on the `under side;`a recess, i.

In ,connnencing to operate with the abov -described parts,"they are iuthel position shown in fig. 1, both 4plunger and cover-plate being elevated to such a height above the base as to permit a" proper quantity of molten glass, rt, to be deposited in the ccntralrecoss a oi the base, aftcrwhiclnboth plunger and the plate B are Idepressed simultaneously, the plate first V'reaching its bearing on the stripperjplatc, against which it may be lielddown byv a suitable-spring.

. and, by the time thc plunger has reached thc limit of its downward movement, as shown in iig. 3, the glass is packed tightly into the space bounded above' by the plunger and recessed coverplate, and below by the stripper-plate and'basc., this space being, in the present instance, such as to produce a jar-cover, M, .of the form clearly indicated in section, in iigs 3 and 4.

Immediately after the glass vhas beenthus pressed,

by the descent of the plunger, the latter and cover-4 plate B are elevated, and then, `before the glass has commenced to shrink, it iselevatediom the base with the stripper-plate C, as shown in tig. 4, and is then conveyed at once to the annealing oven.

In making glass jar-covers, andoth'er objects with ribs or'iianges, they are apt to break, through shrinkage, if not quickl y removed from the mould. For instance, the iia'nge in of the cover (iig. 3) overlaps the annular rib 71,011 the base D, and, immediately after being moulded, commences'to shrink, and, embracing the rib b, will break Aif not quickly removed. Hence, the importance of the stripper-plate O, through the medium of which the cover M can be quickly raised clear of thel E`-base, immediately afterelevating the plunger and cover-plate, and is thus at liberty to contract without interruption.

modification ofthe mould is illustrated in 'iig'.- 4.

'Instead of" making the base in one piece, a central cy-.

lindrical portion, defined by the dotted lines u n, is

- arrangedftoaslide-in' the base, the central portion hav' ing, at -the top, the annular rib b, previously alluded to as forming part of thebase.

While the glass is being pressed by the descent of A theplunger, this central portion is retained in the elevated positioushown in fig. 4, but lafter the plunger has done its duty,the central portion is qickly lowered,

and its annular rib `b freed from the glass cover, which can beremoved by the stripper-plate, as before; or,

V,when the central sliding piece is used,.the stripper# plate may be cutirely'dspensed with, although'l pre'-v i'er to use it in all casesas a ready medium fordctnching `and removing the moulded cover.

It will bc evident that, although I have illustrated and described my invention as applied to moulds for making the glass covers of fruit-jars, it may be' adapted -to the moulding of all such articles of glass as are liable in cooling to contract, and so embrace projecting parts of the mould as to cause fractures.

-It has not been deemed necessary to illustrate or describe the press towhich the different parts of the mould areV connected, as' it maybe similar'to the presses heretofore'nsed, and familiar' to glass-mannfacturers, and asthe appliances for operating the parts may be modified, without1 interfering with the main features of my invention.

I claim as my invention, and desire to secure by Letters Patent- 1. The stripper-plate C, adapted tothe base D and cover-plate l5, substantially as and for the purpose herein set forth. l

2. The annular rib b, on a central piece, D', arranged to slide in'the base D', as set forth, for the purpose speciiied.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Y JOHN Wurm, Lo'UIs BoswELL. 

